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  <h2 class="title">资源类型 </h2>
  <p class="para">
   Most fdf functions require a <em><code class="parameter">fdf</code></em> resource
   as their first parameter. A <em><code class="parameter">fdf</code></em> resource
   is a handle to an opened fdf file. <em><code class="parameter">fdf</code></em>
   resources may be obtained using <span class="function"><a href="function.fdf-create.html" class="function">fdf_create()</a></span>,
   <span class="function"><a href="function.fdf-open.html" class="function">fdf_open()</a></span> and <span class="function"><a href="function.fdf-open-string.html" class="function">fdf_open_string()</a></span>.
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